<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>注册页面</h1>
<form action="">
  <input type="text" name="username" placeholder="用户名"><br>
  <input type="text" name="password" placeholder="密码"><br>
  <input type="text" name="nick" placeholder="昵称"><br>
  <input type="button" value="注册" @click="reg()">
</form>
<!--引入CDN服务器的框架文件-->
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.js"></script>
<script>
  let v = new Vue({
    el:"form",
    methods:{
      reg:function () {
        let data = new FormData(document.querySelector("form"));
        //取出用户输入的用户名和密码
          let username = data.get("username");
          let password = data.get("password");
          if (username.trim()==""||password.trim()==""){
              alert("用户名或密码不能为空");
              return;
          }

        axios.post("/reg",data).then(function (response) {
          if (response.data==1){
            alert("注册成功!");
            location.href="/";//回到首页
          }else{
            alert("用户名已存在!");
          }
        })
      }
    }
  })
</script>
</body>
</html>